XenServer 6.5(SP1) - HVM 're0: watchdog timeout' errors...

[Sydney Meyer]

I just noticed that these performance problems do not occur under 10.0 and 10.1.

Starting with 10.2 IPv4 TCP performance drops from ~12 Gb/s under 10.1 to ~350 Mb/s under 10.2.

Should i write a new bugreport for this?

> On 09 Sep 2015, at 22:58, Sydney Meyer <syd.meyer at gmail.com> wrote:
> 
> Hello,
> 
> I'm running Xen 4.4.1 on a Debian 8 Dom0 and with 2 fresh FreeBSD 10.2 DomU's (pf disabled):
> 
> IPv4:
> - Host A (FreeBSD 10.2): "dd if=/dev/zero bs=1M | nc -l 5001" ---> Host B (FreeBSD 10.2) "nc 10.0.30.95 5001 | dd of=/dev/zero bs=1M" = ~46 MB/s
> - Host A (FreeBSD 10.2): "dd if=/dev/zero bs=1M | nc -l 5001" ---> Host B (CentOS 7) "nc 10.0.30.95 5001 | dd of=/dev/zero bs=1M" = ~65 MB/s
> - Host A (CentOS 7): "dd if=/dev/zero bs=1M | nc -l 5001" ---> Host B (FreeBSD 10.2) "nc 10.0.30.111 5001 | dd of=/dev/zero bs=1M" = ~685 MB/s
> 
> IPv6:
> - Host A (FreeBSD 10.2): "dd if=/dev/zero bs=1M | nc -6 -l 5001" ---> Host B (FreeBSD 10.2) "nc -6 2a02:a03f:a0f:a200:216:3eff:fee0:44bd 5001 | dd of=/dev/zero bs=1M" = ~309 MB/s
> - Host A (FreeBSD 10.2): "dd if=/dev/zero bs=1M | nc -6 -l 5001" ---> Host B (Centos 7) "nc -6 2a02:a03f:a0f:a200:216:3eff:fee0:44bd 5001 | dd of=/dev/zero bs=1M" = ~246 MB/s
> - Host A (CentOS 7): "dd if=/dev/zero bs=1M | nc -6 -l 5001" ---> Host B (FreeBSD 10.2) "nc -6 2a02:a03f:a0f:a200:216:3eff:fe7c:c4bd 5001 | dd of=/dev/zero bs=1M" = ~352 MB/s
> 
> Also, i can confirm problems with FreeBSD 10 acting as a router for other DomU on the same Dom0 (as in https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=188261).
> 
>> On 09 Sep 2015, at 14:27, Roger Pau Monné <roger.pau at citrix.com> wrote:
>> 
>> Hello,
>> 
>> El 09/09/15 a les 11.33, Karl Pielorz ha escrit:
>>> 
>>> 
>>> --On 09 September 2015 11:04 +0200 Roger Pau Monné
>>> <roger.pau at citrix.com> wrote:
>>> 
>>>> I'm working on importing a new netfront from Linux, which hopefully
>>>> should solve the problems we are having with the PV nic.
>>> 
>>> That'll be great - I did test a CentOS box domU a while ago, and that
>>> didn't have the problem with routing traffic, I wasn't able to test
>>> things like OpenVPN/DCHP on it - but the current netfront issues are
>>> annoying [there's at least 2 FreeBSD PR's I know of this would also
>>> address].
>> 
>> Do you have an easy way to replicate those issues, right now I'm trying
>> with the following:
>> 
>> /etc/etc.conf:
>> pf_enable="YES"
>> 
>> /etc/pf.conf
>> block in all
>> pass out all keep state
>> 
>> But I don't seem to be able to reproduce them. Throughput between
>> DomU<->Dom0 or DomU<->DomU seems to be fine (no degradation when
>> compared to pf off).
>> 
>> Roger.
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>